US4711584A - Movement of electronic watch of analog display type - Google Patents

Movement of electronic watch of analog display type Download PDF

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Publication number
US4711584A
US4711584A US06/865,189 US86518986A US4711584A US 4711584 A US4711584 A US 4711584A US 86518986 A US86518986 A US 86518986A US 4711584 A US4711584 A US 4711584A
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US
United States
Prior art keywords
baseplate
movement according
gears
rotor
bearing plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/865,189
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English (en)
Inventor
Masayoshi Tanazawa
Masaru Shoji
Wataru Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casio Computer Co Ltd
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Casio Computer Co Ltd
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Filing date
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Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Assigned to CASIO COMPUTER CO. LTD. reassignment CASIO COMPUTER CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHOJI, MASARU, TANAZAWA, MASAYOSHI, YAMADA, WATARU
Application granted granted Critical
Publication of US4711584A publication Critical patent/US4711584A/en
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by master-clocks
    • G04C13/08—Slave-clocks actuated intermittently
    • G04C13/10—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms
    • G04C13/11—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms with rotating armature
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B29/00—Frameworks
    • G04B29/02—Plates; Bridges; Cocks
    • G04B29/027—Materials and manufacturing
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/008—Mounting, assembling of components

Definitions

  • This invention relates to a movement for an electronic watch of analog display type, for displaying the time with hands.
  • the object of the invention is to provide a movement for an electronic watch of analog display type, which permits ready processing of components, has much greater ease of assembly and thus permits reductions in cost and weight.
  • FIG. 1 is an exploded perspective view showing an embodiment of the movement for an electronic watch of analog display type
  • FIG. 2 is a plan view showing the movement shown in FIG. 1;
  • FIG. 3 is a sectional view showing the movement shown in FIG. 1;
  • FIG. 4 is a sectional view showing a rotor in the movement
  • FIG. 5 is a plan view showing the rotor shown in FIG. 4;
  • FIG. 6 is an enlarged-scale side view showing a second gear wheel
  • FIG. 7 is an enlarged-scale plan view showing an essential part of the gear of the second gear wheel.
  • FIG. 8 is an enlarged-scale plan view showing an essential part of a pinion of the second gear wheel.
  • FIGS. 1 to 3 illustrate a movement of an electronic watch of analog display type embodying the invention.
  • the movement illustrated is of the two-hand type. It comprises step motor 1 and gear train 2.
  • Step motor 1 drives gear train 2, which in turn drives the hands (not shown) to display the time.
  • Step motor 1 includes coil 3, stator 4 and rotor 5.
  • Rotor 5 is turned by one half rotation every time a pulse signal is supplied to coil 3.
  • Step motor 1 is mounted by screws 7 on baseplate 6.
  • Rotor 5 is located in circular hole 4a of stator 4. Its upper and lower ends are journaled in baseplate 6 and bearing plate 8, respectively. Cylinder projection 6d of baseplate 6 is fitted into circular hole 4a of stator 4 to locate stator 4.
  • FIGS. 4 and 5 show rotor 5.
  • Rotor 5 consists of rotor body 10 and ring-like magnet 9. Magnet 9 is secured in rotor body 10 at the time of formation of a gear section of the rotor.
  • Rotor body 10 is a one-piece resin molding having pinion 10a and shaft portion 10b.
  • Rotor 5, except for magnet 9, is made of a material composed of nylon system and acetal system resins, containing reduced potassium titanate whisker introduced as a reinforcing agent.
  • Rotor body 10 has frame portion 10c for holding one end of magnet 9, and stopper 10d for retaining magnet 9 against detachment.
  • Rotor body 10 of rotor 1 is molded by forcing a synthetic resin material into a die with magnet 9 set therein in advance.
  • the resin material is introduced into inner space 9a of magnet 9, whereby molded rotor body 10 and magnet 9 become integral.
  • suitable indentations or the like may be provided on the coupled surfaces of rotor body 10 and magnet 9, whereby the two parts may be more firmly coupled together to prevent their relative rotation.
  • Gear train 2 serves to transmit the rotation of rotor 5 to the hands (not shown). As shown in FIG. 1, it includes first to fourth gear wheels 11 to 14. Second gear wheel 12 is a minute hand gear wheel, and fourth gear wheel 14 is an hour hand gear wheel. First to third gear wheels 11 to 13 are journaled between baseplate 6 and bearing plate 8. Fourth gear wheel 14 is located on the lower side of baseplate 6. First gear wheel 11 rotates in mesh with pinion 10a of rotor 5. Second gear wheel 12 rotates in mesh with pinion 11a of first gear wheel 11, as shown in FIG. 3. Its shaft projects as minute hand shaft 12b from the lower side of baseplate 6. A minute hand (not shown) is installed on the projecting lower end of shaft 12b.
  • Third gear wheel 13 rotates in mesh with pinion 12a of second gear wheel 12, and its rotation is transmitted to fourth gear wheel 14. Its shaft 13b projects through baseplate 6 and has pinion 13a located on the projecting lower end. Fourth gear wheel 14 rotates in mesh with pinion 13a of third gear wheel 13. Minute hand shaft 12b of second gear wheel 12 is fitted in fourth gear wheel 14. Fourth gear wheel 14 is journaled on bearing portion 6a of baseplate 6. An hour hand (not shown) is installed on lower end 14 a of fourth gear wheel 14. Bearing plate 8 is positioned on posts 6b provided on base plate 6 and secured thereto by screws 15.
  • the magnet when producing a rotor consisting mainly of a resin material, the magnet is made integral during the formation of a gear section. Therefore, deviation of the axis of the gear section and the axis of the ring-like magnet relative to each other never occurs. The alignment precision thus can be greatly improved.
  • the gear section can be integrated without the need to pressure fit the magnet. Therefore, unlike the case of the prior art, there is no possibility of occurrence of a rejected rotor due to damage caused to the pressure fitted magnet.
  • the gear section side frame portion, for holding the magnet has a shape capable of maintaining the balance of the rotor when the rotor is rotated. The rotor thus can be rotated stably. This frame portion holds one end of the magnet. Thus, when setting the magnet in a die, it will be properly secured inside the die cavity and core.
  • Gear wheel 14 is held in contact with baseplate 6 by a plurality of protuberances 14b formed on its flat surface.
  • Reference numeral 16 in FIG. 2 denotes a flexible base with two ends 16b and 16c. End 16b is secured together with end 17a of coil core 17 by screw 7 to baseplate 6. Other end 16c is assembled without excessive force on post 6c of baseplate 6, as shown in FIG. 1. On post 6c, an electronic circuit board (not shown), for supplying a drive signal to coil 3, is also assembled to face end 16c.
  • Flexible base 16 has flexible, sheet-like insulating member 16a provided on one side. Electrode leads 18 are formed on insulating member 16a. Flexible base 16 has a curved or folded shape like a "J" shape. Leads 18 have terminal portions 18a and 18b, and at ends 16b and 16c of flexible base 16, insulating member 16a is formed with mounting holes 21 close to terminal portions 18a and 18b.
  • Insulating member 16a has tongue-like engagement portion 22, which serves to guide leads 23 to connect (i.e., solder) with terminal portions 18a and also to temporarily secure the ends of these leads.
  • the curved flexible base is used for the connection between the coil section and electronic circuit section. Therefore, although the coil section and electronic circuit section are in the vicinity of each other, the flexible base can be flexed very gently due to its curved shape.
  • the flexing of the base is produced by a slight difference in level between the assembly positions of the two terminal sections.
  • the flexible base thus can be assembled without causing undue flexing or distortion of the electrode leads on the surface.
  • the flexible base thus has extremely high durability with respect to long use, so that is possible to provide a stable product. Further, since no forced flexing is required at the time of assembly, ease of assembly can be improved. Further, versatility can be improved to accommodate an increased variety of modules.
  • Baseplate 6 and bearing plate 8 can be made from any one of four different materials, i.e. PPS (polyphenylene sulfide) containing glass fiber; PPS containing glass fiber and polyamide; polysulfon containing glass fiber and polyether sulfon containing glass fiber.
  • PPS polyphenylene sulfide
  • the second mentioned material has satisfactory wear-resistance properties and durability due to its polyamide content.
  • it can increase the wear-resistance properties and strength of the bearing sections of baseplate 6 and bearing plate 8, and permits trouble free mounting of metal posts through pressure fitting, without the possibility of crack formation. Further, warping can be reduced by appropriately setting the thicknesses of various portions of the baseplate and bearing plate. The baseplate and bearing plate can thus be formed very precisely, making possible improvements in productivity.
  • the third and fourth materials mentioned above have satisfactory thermal creep properties. That is, when pressure is applied to them under high temperature conditions, they experience less deformation; so it is possible to eliminate looseness of bolts for example. Further, high tenacity can be achieved. Thus, the metal posts can be mounted easily through pressure fitting, without the possibility of crack formation. Further, since material tenacity is high, burrs are less liable to result at the time of molding, and it is possible to obtain precise molding, and thus improve productivity.
  • the filler of the above materials is not limited to glass fiber; it is also possible to incorporate carbon, potassium titanate whisker, reduced potassium titanate whisker, etc.
  • Gear wheels 11 to 14 of gear train 2 are made of a material composed of a resin of nylon system, acetal system, etc. and containing reduced potassium titanate whisker incorporated as a reinforcing agent.
  • Reduced potassium titanate has the same mechanical properties as potassium titanate and permits an increase in mechanical strength. Also, it has electric conductivity and can prevent charging by static electricity.
  • second gear wheel 12 has a structure as shown in FIGS. 6 to 8.
  • the gear of second gear wheel 12 in mesh with pinion 11a of first gear wheel 11, as shown in FIG. 7, has pitch line Dp with a diameter of 3.9 mm, deddendum circle Dr with a diameter of 3.692 mm and an addendum circle Dk with a diameter of 3.992 mm.
  • Its tooth number Z is 60
  • its module M (defined as a ratio between a pitch line with a diameter and the tooth number); is 0.065, which is the same as that of pinion 11a of first gear wheel 11.
  • the top of its teeth has a diameter R of 0.0459 mm.
  • This diameter is at least 0.4 times that of module M (in the present case 0.706 times).
  • Pinion 12a of second gear wheel 12 as shown in FIG. 8, has pitch line Dp with a diameter of 1.150 mm, deddendum circle Dr with a diameter of 0.874 mm, and an addendum circle Dk with a diameter of 1.403 mm.
  • Its tooth number Z is 10 and module M is 0.115, the same as that of third gear wheel 13.
  • the top of its teeth has a diameter R of 0.046 mm, which is 0.4 times that of module M.
  • This type of second gear wheel 12, made from a synthetic resin can be fabricated using a molding die which is produced by a wire discharge process.
  • Wire of thickness (diameters) 0.05 mm and 0.03 mm can be used for the wire discharge process.
  • the minimum radius is 0.03 mm, and the minimum obtainable module M of the gear, in this instance.
  • the minimum radius is 0.02 mm, and the minimum obtainable module M of the gear, in this instance, is 0.05.
  • the molding die for producing second gear wheel 12 may be produced satisfactorily and very precisely by the wire discharge process. Second gear wheel 12 can thus be produced easily and satisfactorily, permitting improvement in productivity.
  • Gear wheels 11 to 14 may have different colors; for instance first gear wheel 11 may be red, second gear wheel 12 gray, third gear wheel 13 blue and fourth gear wheel 14 black. This will facilitate the assembling operation, and the worker can correctly and quickly assemble the gear train. In addition, the inspector can immediately confirm that a right-hand gear wheel is assembled in the right-hand position in the gear train.
  • second gear wheel 12, inclusive of minute hand shaft 12b with its top surface projected from the face of a watch may be colored the same as the minute hand, by use of a pigment, during the molding process.
  • second gear wheel 12, with its shaft 12b may be made gray, a color of the same system.
  • second gear wheel 12 with its shaft 12b may be made yellow, a color of the same system.
  • second gear wheel 12 and its shaft 12b made gray, a black hand does not seem so different in color.
  • minute hand shaft 12 (which appears at the top), given a color of the same system as that of the minute hand, no substantial color difference can be noted, and the hand and hand shaft will seem integral, which is desirable from the standpoint of design and appearance.
  • pigments are incorporated when molding second gear wheel 12 as the minute hand gear wheel, and fourth gear wheel as the hour hand gear wheel.
  • gear wheels 12, after molding may be coated with paint.
  • paint need not be coated on the entire surfaces of gear wheels 12, but may be coated only on portions of shafts 12a and 14a which are exposed.
  • paint may be coated only on the top of minute hand shaft 12b.
  • a better outer appearance is obtained if fourth gear wheel 14 with the four hand mounted thereon is painted with the same color as that of the hour hand.
  • the above embodiment is concerned with a two-hand type analog movement, the invention is of course also applicable to a three-hand type analog movement. Further, the invention is applicable not only to electronic watches but also to other timepieces.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Electromechanical Clocks (AREA)
  • Gears, Cams (AREA)
US06/865,189 1985-06-24 1986-05-19 Movement of electronic watch of analog display type Expired - Lifetime US4711584A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1985094371U JPS623085U (ru) 1985-06-24 1985-06-24
JP60-94371[U] 1985-06-24

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853909A (en) * 1987-04-09 1989-08-01 Casio Computer Co., Ltd. Time correction mechanism for an analog timepiece using plastic gears for transmitting the rotation of the manual operation member to the hands
US4858210A (en) * 1986-11-19 1989-08-15 Casio Computer Co., Ltd. Apparatus with synthetic resin hand shaft
US5155711A (en) * 1992-04-30 1992-10-13 Timex Corporation Movement subassembly for a three and two hand timepiece using common piece parts
US5515607A (en) * 1987-07-21 1996-05-14 Seiko Epson Corporation Method of manufacturing a timepiece wheel
WO2000063749A1 (de) * 1999-04-21 2000-10-26 Conseils Et Manufactures Vlg Sa Uhrwerk mit einem mikrogenerator und testverfahren für uhrwerke
US20040008583A1 (en) * 2002-07-15 2004-01-15 Bok-Kwon Lee Wristwatch equipped with device for elimination of static electricity
US20050078561A1 (en) * 2001-11-02 2005-04-14 Morinobu Endo Slide part and precision part, and timepiece and electronic device using them
US20060164925A1 (en) * 2001-12-21 2006-07-27 Morinobu Endo Timepiece including base plate formed of resin and wheel train
US7170827B2 (en) * 2001-12-21 2007-01-30 Kitagawa Industries Co., Ltd Timepiece, having bearing portion formed of resin and wheel train
CN113805459A (zh) * 2020-06-12 2021-12-17 Eta瑞士钟表制造股份有限公司 钟表机芯的马达模块

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5435540B2 (ja) * 2008-10-29 2014-03-05 張明輝 時計の分解・組み立て方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006093A (en) * 1977-10-14 1979-05-02 Citizen Watch Co Ltd Moulded timepiece part
GB2074350A (en) * 1980-04-01 1981-10-28 Citizen Watch Co Ltd Arrangement for analog-type electronic wristwatch
GB2085621A (en) * 1980-10-21 1982-04-28 Suwa Seikosha Kk Timepiece
GB2127991A (en) * 1982-09-29 1984-04-18 Timex Corp Date setting mechanism in a wristwatch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006093A (en) * 1977-10-14 1979-05-02 Citizen Watch Co Ltd Moulded timepiece part
GB2074350A (en) * 1980-04-01 1981-10-28 Citizen Watch Co Ltd Arrangement for analog-type electronic wristwatch
GB2085621A (en) * 1980-10-21 1982-04-28 Suwa Seikosha Kk Timepiece
GB2127991A (en) * 1982-09-29 1984-04-18 Timex Corp Date setting mechanism in a wristwatch

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858210A (en) * 1986-11-19 1989-08-15 Casio Computer Co., Ltd. Apparatus with synthetic resin hand shaft
US4853909A (en) * 1987-04-09 1989-08-01 Casio Computer Co., Ltd. Time correction mechanism for an analog timepiece using plastic gears for transmitting the rotation of the manual operation member to the hands
US5515607A (en) * 1987-07-21 1996-05-14 Seiko Epson Corporation Method of manufacturing a timepiece wheel
US5155711A (en) * 1992-04-30 1992-10-13 Timex Corporation Movement subassembly for a three and two hand timepiece using common piece parts
US6714487B2 (en) 1999-04-21 2004-03-30 Conseils Et Manufacture Vlg S.A. Watch movement with a microgenerator and method for testing watch movements
WO2000063749A1 (de) * 1999-04-21 2000-10-26 Conseils Et Manufactures Vlg Sa Uhrwerk mit einem mikrogenerator und testverfahren für uhrwerke
US20050078561A1 (en) * 2001-11-02 2005-04-14 Morinobu Endo Slide part and precision part, and timepiece and electronic device using them
US7575800B2 (en) 2001-11-02 2009-08-18 Kitagawa Industries Co., Ltd. Sliding parts, precision parts and timepieces and electronic equipment using the same
US20090286064A1 (en) * 2001-11-02 2009-11-19 Kitagawa Industries Co., Ltd. Sliding parts, precision parts and timepieces and electronic equipment using the same
US20110086976A1 (en) * 2001-11-02 2011-04-14 Kitagawa Industries Co., Ltd. Sliding parts, precision parts and timepieces and electronic equipment using the same
US20060164925A1 (en) * 2001-12-21 2006-07-27 Morinobu Endo Timepiece including base plate formed of resin and wheel train
US7167420B2 (en) * 2001-12-21 2007-01-23 Kitagawa Industries Co., Ltd Timepiece including base plate formed of resin and wheel train
US7170827B2 (en) * 2001-12-21 2007-01-30 Kitagawa Industries Co., Ltd Timepiece, having bearing portion formed of resin and wheel train
US6771566B2 (en) * 2002-07-15 2004-08-03 Bok-Kwon Lee Wristwatch equipped with device for elimination of static electricity
US20040008583A1 (en) * 2002-07-15 2004-01-15 Bok-Kwon Lee Wristwatch equipped with device for elimination of static electricity
CN113805459A (zh) * 2020-06-12 2021-12-17 Eta瑞士钟表制造股份有限公司 钟表机芯的马达模块
CN113805459B (zh) * 2020-06-12 2023-03-28 Eta瑞士钟表制造股份有限公司 钟表机芯的马达模块

Also Published As

Publication number Publication date
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